The present invention provides an auto-injection device including a housing, a container from which a product is dispensed by advancing a piston, the container shiftably accommodated by the housing and carrying a needle, and a drive unit including a driven member, wherein the driven member is shiftably...http://www.google.com.au/patents/US6620137?utm_source=gb-gplus-sharePatent US6620137 - Automatic injection device
